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Michael Isaacson, the "antifa professor" who was placed on leave after several of his shockingly hostile anti-police tweets were made public, has a dark and frankly repulsive secret that is now not-so secret.

PJ Media covered Isaacson's heinous anti-cop exploits here and here and his involvement with #DisruptJ20 as a leader of the violent antifa group Smash Racism (as caught on tape by Project Veritas) here and here.

Internet sleuths discovered that Isaacson (@VulgarEconomics on Twitter) has a fetish website profile in which he describes himself as "polyamorous" and "pansexual" and claims to be turned on by waterboarding, choking, smothering, anal sex, group sex, bondage and other nasty, depraved sex fetishes.

KIWI Farms has screenshots of Isaacson's most violent and sexually deviant tweets -- which go way beyond what most people would consider normal.

Peruse at your own risk.

But it gets worse.

James O'Keefe caught Isaacson, a co-founder of the antifa group Smash Racism, on tape back in January plotting out ways to shut down the metro in Washington, D.C., during President Trump's inauguration.

He can also be be seen in the second Project Veritas DisruptJ20 sting video urging fellow agitators to "throat punch" Trump supporters attending the inauguration. Isaacson justified the violence by portraying all Trump supporters as Nazis.

"Generally speaking, Nazis will only actually attack people if they strongly outnumber them because Nazis are essentially cowards. So if it's three of them and a homeless guy, they're going to beat him up. If it's one of them and like six other people, they're gonna run the f*ck away," he said.

Isaacson added, "Bring it, throat punching is probably a good thing."

When one of the saner-sounding agitators asked Isaacson if physically attacking people in the streets was actually a good idea, he answered: "Ultimately, the question is one of political power, right? So I mean if there's media present, you probably don't want to start a fight. You might, like, get arrested, later." He added, "But like -- if they feel safe to take the streets, they will convince their friends that they are also safe to take the streets."